Adding machine



Sept. 7 1926.

LE ROY J. LEISHMAN ADDING MACHINE Filed Oct. 24, 1919 l .v .Eiwwwwl aww/w Foz van' attoumrv Patented Sept. 7, 1926.

UNITED STATES LE BOY J. LEISBMAN, 0F OGDEN, UTAH.

IADDING MACHINE.

Application led Uotober 24, 1919. Serial No. 888,010.

This invention relates to adding machines and has for its object the improvement in general in such machines and particularly improvement in the carrying mechanism.

In the drawings,-

Figure 1 is a plan view of my device;

Fig. 2 is a similar view, but with the top plate removed so that the entire working mechanism, including the carrying devices, may be shown; and

Fig. 3 is a vertical section on the broken line 3-3 of Fig. 2.

In its preferred form, my device is constructed entirely of metal, the base 4 being preferably rectangular with rounded ends 5 and having a slight upturned marginal flange 6 of just suicient height to enclose the mechanism, thereby forming an adding machine of small compass. This flange 6 is referably held in proper position by stu s 7 located at proper intervals about the edge of the base 4 and having reduced ends 8 to receive the cover plate 9 and to hold it as well as the flange Mounted centrally and longitudinally of the base plate 4 are a plurality of dials 10 preferably seven in number, this giving a capacity of ten million or in money one hundred thousand dollars. Each of the dials is mounted on a central pivot 11 secured to the base 4 and consists of a stamped sheet of metal having ten teeth 12 on the periphery thereof and a similar number of holes 13 having their centers each on a radial line with the short side of one of said teeth 12. The numerals 0 to 9 are stamped on the dials between the line of the teeth and the line of the holes 13, each numeral being spaced midway between the holes 13. At the extremity of the tooth 12 between the numerals 9 and 0 is a pin 14 projecting at right angles to the face of the dial to engage with the finger 15 of the pawl 16 which is the main element of the improved carrying mechanism which forms the primary feature of the present invention. This pawl 16 has a central slot '17 and has near the center of the pawl a lug 32 to which is connected a spring 18 the other end of which is secured in a small hook 19 firmly attached to the base plate 4. A stud 20 on the base plate passes through the slot 17 and holds the pawl in positlon, the normal position being a,s illustrated in Fig. 2, such position bein maintained by means of the s ring 18 hol ing the pawl against the Stu 20 at its forward or finger end, and also holding the catch 21 at the other end of the pawl in engagement with one of the teeth 12 of the dial. It will be noted that the pawl can turn angularly on the stud as a pivot and can also move longitudinally with respect to the stud or pivot when the catch has been free from engagement with the tooth, but that each of such movements is resisted by the action of the spring which, being located on the other side of the pivot from the catch 21, holds the latter downward, that is, in engagement with the dial. The pawl 16 is formed of sheet metal and is flat from the catch end up to the line 22 at which point the tapered end 16 is raised above the remaining surface by a sufficient amount to just clear the dials, such reduced end 16 being preferably thinned although it may be of the same thickness as the rest of the pawl so Vthat it can be stamped out of sheet metal. The spring 23 secured at 24 to the base plate is provided with a curved portion 25 engaging with a long face of one of the teeth to hold the dial still and also to assist in bringing the numerals to correct registry. should the dial by any chance be turned slightly from its proper osition.

The cover plate 9 is o thin sheet metal and is provided with a number of openings 26 corresponding in number to the dials, each of such openings being provided with a sight window 27 and having at the opposite or lower side a raised projection or lug 28 for limiting the movement of the stylus, not shown, which operates the dials. The numerals 1 to 9, inclusive, are spaced around the opening 26 with the numeral 9 to one side of the stop lug 28 and with the numerals 4 and 5 spaced on either side of the sight window 27.

To operate, the point of the stylus is placed in the hole 13 of the appropriate dial on a radial line with the number to be added, which number is indicated by the series of numerals 30 on the cover plate, and the dial is rotated clockwise until the stylus comes into contact with the lug or stop 28. The numerals 30 are preferably of contrasting colors so that, for example, red numerals indicate dimes and cents, black numerals indicate the next three units, that is, dollars, tens and hundreds, and the higher dials are again in red. This, however, is old in the art and is not a part of the present invention, but it is stated to show my preferred form. If the machine has been properly cleared, the numeral added will be shown in the sight window 27 by one of the numerals 31 on the dial 10. Whenever the tooth ca ing the numeral 9 is about to pass the nger 15 of the carrying mechanism, the in 14 will engage such finger` since the ot er end of the pawl is held in contact with a tooth 12 of the next higher dial, so that continued movement of the first dial will draw the pawl 16 forwardly until the short edge of tooth 12 can slip past the catch 21, at which time, since the finger end can now move away from the pin, it will also free the pin meral 9 through the window 27, the passing of a pin 14 on the next lower dial, would move all of such dials one point each, such simultaneous movement being taken care of by the various pawls 16, each of which, it will be noted is independent of.

all others.

The red circle 33 about the hole 13 between numerals 5 and 6 is for convenience in clearing the machine, the insertion of the stylus in the so marked hole and the bringing of it to the stop lug brings the numeral 0 to the window 27. The star 34 is also for clearing but is rotated backward to the stop lug.

lVhat is claimed is:

1. In an adding machine, a base, a plurality of toothed dials mounted thereon, a pin on each dial` and a series of overlapping one-piece pulling pawls each having a catch to engage a tooth.of a dial and a finger to stand in the path of the pin on the next adjacent dial.

2. A one-piece carrying mechanism for an adding machine comprising a slotted pawl having a catch at its forward end and an elongated finger at its opposite end.

3. A one- 1ece carrying mechanism for an adding mac ine comprising a slotted pawl having a catch at its forward end and an elongated finger at its opposite end, said elongated finver bein spaced from the plane of the ace of t e remainder of the pawl.

4. A oneiece carrying mechanism for an adding mac ine comprising a slotted awl having a catch at its forward end an an' elongated finger at its opposite end, said elongated finger being spaced from the plane of the face of the remainder of the pawl, and a lug upon-one edge of said pawl adapted to receive a spring.

5. In an adding machine, a base, a plurality of toothed dials pivoted thereon, a stud in said base, a one-piece slotted pawl slidably and pivotally mounted on said stud and having a catch to engage a tooth of one dial, means for yieldingly holding said catch and tooth in' contact, and additional means for sliding said pawl to rotate said dial on its pivot.

6. In an adding machine, a base, a plurality of toothed dials pivoted thereon, a stud in said base, a one-piece slotted pawl slidably and pivotally mounted on said stud and having a catch to engage a tooth of one dial, means for yieldingly holding said catch and tooth in Contact, additional means for sliding said pawl to rotate said dial on its pivot, and means for yieldingly resisting rotation of said dial.

7. In an adding machine, a base, a plurality of toothed dials pivoted thereon, a stud in said base, a one-piece slotted pawl slidably and pivotally mounted on said stud and having a catch to engage a tooth of one dial, means for sliding said pawl to rotate said dial on its pivot, means Afor yieldingly resisting' rotation of said dial, and a spring attached to said pawl to hold said catch and tooth incontact.

LE ROY J. LEISHMAN. 

